CN210197009U - System for LNG receiving station gasification equipment jointly utilizes with power plant's circulating water - Google Patents
System for LNG receiving station gasification equipment jointly utilizes with power plant's circulating water Download PDFInfo
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Abstract
The utility model relates to a system that LNG receiving station gasification equipment and power plant's circulating water jointly utilized, the system includes: IFV vaporizer, sea water circulating pump, power plant's circulating water system is including the circulating water cooling tower, the pond under the tower, the pond that absorbs water, the water intaking pump that connect gradually, each cooling water equipment of power plant. LNG utilizes the circulation return water of power plant's circulating water field as the heat source, and LNG itself receives the heat gasification for NG, and the circulating water return of refrigerated simultaneously returns power plant circulating water device, and as the cooling cycle water supply of power plant condenser, heat exchanger, energy cascade utilization. IFV vaporizer export sets up temperature control TCV valve opening, ensures that the temperature of supplying with the water temperature of power plant in a lower scope, and this control interlock realizes whole control process through temperature, flow transmitter and the PLC hard wire that sets up on IFV vaporizer drainage side pipeline.
Description
Technical Field
The patent of the utility model relates to a LNG receiving station gasification equipment, power plant's circulating water system field, concretely relates to system that LNG receiving station gasification equipment and power plant's circulating water jointly utilized can realize one set of water intake device of LNG receiving station gasification equipment and power plant's sharing.
Background
LNG is natural gas that exists in liquid form at cryogenic temperatures and is stored at temperatures of about-162 ℃. Usually, LNG is required to be regasified to gaseous natural gas for utilization, general LNG receiving stations are all built on coastal and along river ports, seawater pumps are arranged, the LNG is gasified by taking seawater as a heat source, and heat exchange of condensers, heat exchangers and boilers of power plants also requires that sites of the power plants are as close to water sources as possible. This creates the possibility of using a water intake device in conjunction with the LNG receiving station and the power plant.
The cold energy stored in the LNG is very huge, and the recovery of the part of energy has very considerable economic and social benefits; conversely, if not recycled, this portion of the cold energy is typically lost with the seawater or air in the gasifier, and the waste is staggering.
Particularly, with the vigorous development of domestic LNG receiving stations like bamboo shoots in the spring after rain in recent years, how to reasonably and economically utilize the low-temperature cold energy of LNG becomes the focus of attention of each construction party. Japan is a country with good utilization of cold energy in the world, domestic receiving stations such as Tantan and eastern stations are built into low-temperature LNG air separation plants, and Zhoushan LNG receiving station is also built into complete sets of devices for cold energy power generation and cold energy ice making. After years of practice and research, several technologies for LNG cold energy utilization become mature, and new utilization schemes are continuously proposed.
Besides energy conservation and emission reduction, the LNG cold energy utilization technology can drive the development of related cold chain industries, such as: power generation equipment, air separation, light hydrocarbon recovery, low-temperature crushing, seawater desalination, freezing, dry ice manufacturing and the like. In view of the good environmental and economic benefits of low-temperature LNG, especially under the development demand of seeking for sustainable development of economy, society and environment at the present stage of China, the development of cold energy utilization facilities of LNG receiving stations is the requirement of the times and the demand of development, and is also a green project benefiting the nation and the people.
The large-scale power plant is a large consumer using water, the cold energy of circulating water is utilized to cool key equipment (a condenser and a heat exchanger), the water consumption requirement of an open cooling tower applied to the current power plant is very large, the water supplementing quantity required by a closed circulating cooling tower (a GEA system, a Hamon system and a Hahler system) is also very large, and meanwhile, the water quality required by water supplementing also has very large requirements.
The site selection of traditional LNG receiving station all is close to the seaside, utilizes the sea water heat transfer, need construct the sea water pipe network alone, draws the sea water to remove IFV, sends IFV drainage back to the sea water pipe network again, and the difference in temperature is only 5 ℃, is that the change in order to guarantee the temperature can not cause the influence to marine organism's survival. Under the precondition, the sea water amount required by a single IFV gasifier (intermediate medium type gasifier) of 200t/h reaches 8000 t/h.
When the two systems are implemented independently, the following problems generally exist in the actual engineering case:
1. the water consumption of the power plant is large, and the cooling time of circulating water is long;
2. the LNG receiving station has large water demand, and the independent discharge is limited by the change of environmental protection temperature;
3. a water taking device and a seawater pipe network are required to be built in a cooling water system and an LNG receiving station of a power plant, and related equipment, pipelines, instruments, electricity and the like are involved, so that the investment amount is large;
4. the economic benefit and the environmental benefit are influenced to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the technical problem, provide a LNG receiving station gasification equipment process systems through optimizing to set up necessary emergency stop system.
According to the utility model discloses, a system that LNG receiving station gasification equipment and power plant's circulating water jointly utilized is provided, the system includes: an IFV gasifier, a seawater circulating pump and a power plant circulating water system, wherein the power plant circulating water system comprises a circulating water cooling tower, a water tank under the tower, a water suction pool, a water taking pump (a seawater circulating pump) and various cooling water equipment of a power plant which are connected in sequence,
the natural gas inlet end of the IFV gasifier is connected with an LNG feeding pipe, the natural gas outlet end of the IFV gasifier is connected with an NG discharging pipe, the seawater inlet end of the IFV gasifier is connected with a seawater pipe network from each water-using device of the power plant, the seawater outlet end of the IFV gasifier is connected with a water absorption pool of the power plant, the water absorption pool is connected with each water-using device of the power plant through a pipeline,
a seawater circulation pump for preventing silt from depositing in the gasifier pipe and a flow meter for detecting a low flow signal (for example, seawater flow rate below 1000 m) are arranged on an outlet pipeline of the IFV gasifier3At/h) the seawater circulation pump can be started.
Further, set up temperature detection, changer and Temperature Control Valve (TCV) at IFV vaporizer sea water outlet side, through hard wire automatic control TCV valve aperture, the sea water temperature increases valve aperture when being less than 5 ℃, the temperature reduces valve aperture when being higher than 5 ℃, the sea water is sent into power plant's circulating water field pond (water absorption pool), utilize the circulating water pump that the power plant set up to send the low-temperature cooling water into each heat exchanger of power plant and carry out the heat exchange, the high temperature circulating water after the heat exchange loops back to the IFV vaporizer of LNG receiving station, the degasification LNG.
Further, a seawater flow meter for directly metering seawater into the inlet of the IFV gasifier is arranged on the seawater inlet side of the IFV gasifier.
And further, an inlet shutoff valve is arranged on an LNG inlet pipe at a natural gas inlet end of the IFV gasifier, an outlet shutoff valve is arranged on an NG discharge pipe at a natural gas outlet end, when the flow rate of seawater of the IFV gasifier is lower than a set value, a flowmeter detects a low-flow signal, the low-flow signal is transmitted to a central control room through a transmitter and an instrument cable, a low-flow alarm is sent out in a DCS system, and the inlet shutoff valve and the outlet shutoff valve of the IFV gasifier are closed through an SIS system in an interlocking manner.
Furthermore, a temperature detection and transmitter is arranged at a seawater outlet of the IFV gasifier, and after the temperature is monitored to be low and alarm, a signal is sent to the SIS system through an instrument cable, and an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking manner, so that a heat exchange tube of the IFV gasifier is not influenced by low temperature, and the equipment is prevented from being frozen and stopped.
Furthermore, a temperature detection transmitter is arranged at a seawater inlet of the IFV gasifier, after the temperature is monitored to be low and alarm, a signal is sent to the SIS system through an instrument cable, an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking manner, so that the heat exchange tube of the IFV gasifier is not influenced by low temperature, the equipment is prevented from being frozen and stopped, the inlet and outlet sides of seawater are provided with a low-temperature interlocking, and the safe operation of the IFV gasifier is effectively guaranteed.
In a circulating water system of a power plant, seawater enters a tower lower water tank of a circulating water cooling tower from a seawater replenishing self-taking pump, then enters a water suction tank, enters each water-consuming equipment of the power plant through a circulating water pump, enters an IFV gasifier after heat exchange of each water-consuming equipment of the power plant, and a seawater outlet of the IFV gasifier is connected with the water suction tank, so that a closed circulating water system is formed.
Further, the intermediate medium of the IFV gasifier is propane.
LNG utilizes the circulation return water of power plant's circulating water field as the heat source, and LNG itself receives the heat gasification for NG, and the circulating water return of refrigerated simultaneously is sent back to power plant's circulating water device, and as the cooling cycle water supply of power plant's condenser, heat exchanger, the energy cascade utilization. When the flow of the seawater is less than 1000m3H, in order to prevent the sediment from depositing in the gasifier pipe, a flow rate of 600m is arranged outside the IFV gasifier3A seawater circulating pump of the/h and a matched control system, a pipeline system and the like. IFV vaporizer export sets up temperature control TCV valve opening, ensures that the temperature of supplying with the water temperature of power plant in a lower scope, and this control interlock realizes whole control process through temperature, flow transmitter and the PLC hard wire that sets up on IFV vaporizer drainage side pipeline.
The system comprises a gasification device, a control system and a control system, wherein the gasification device comprises an IFV gasifier, a seawater circulating pump, a process pipeline, a valve, an instrument and a corresponding control interlocking system;
the power plant circulating water system comprises a circulating water cooling tower, a water tank under the tower, a water suction pool, a water taking pump, cooling water equipment for each power plant, a process pipeline, a valve, an instrument and a corresponding control system.
The system is suitable for projects where the power plant and the LNG receiving station are constructed adjacently.
IFV vaporizer drainage side seawater flow through setting up temperature detection, changer, flowmeter and the governing valve TCV in the drainage side, controls the seawater temperature of IFV vaporizer drainage side, and after reaching the setting value, the TCV valve is automatic to be opened, sends the low temperature circulating water back to the power plant, guarantees to supply with the circulating water temperature control of giving the power plant about 5 ℃.
The temperature difference of supply water and return water of the circulating water field is changed along with the change of seasons, the temperature difference change is large, the electricity utilization month (7-8 months) is particularly obvious in the peak of summer, the water consumption of a single IFV gasifier is increased along with the temperature difference of seawater, the required seawater amount is further reduced, and the required circulating water is 4000t/h (traditionally 8000t/h) by taking the IFV gasifier with the gasification amount of 200t/h as an example. On the other hand, circulating water with too small flow flows into the IFV gasifier, and the flow velocity of the seawater is low, so that sediment deposition at a seawater transition section is easily caused, operators of the LNG receiving station are required to clean the IFV gasifier regularly, and the operation cost is increased. The utility model discloses in order to further solve this difficult problem, add the sea water circulating pump in IFV vaporizer sea water side, draw a bypass line to IFV vaporizer sea water import at IFV vaporizer sea water outlet side, establish the sea water inner loop of an IFV vaporizer, be less than 1000m when the required circulating water yield of IFV vaporizer3During/h, the seawater circulating pump is automatically started through the flowmeter detection and transmitter arranged on the IFV seawater drainage side and the DCS control interlocking system, and the flow of the seawater circulating pump is adjusted at a later period of time, so that the possibility of sediment deposition of the transition section of the IFV gasifier is reduced, and the manual cleaning cost is reduced.
In order to ensure the safe operation of the IFV gasifier, a low-flow interlock and a low-temperature interlock are arranged at the inlet of the IFV gasifier (connected behind a return line of a seawater circulating pump), and a low-temperature interlock is arranged at the inlet side of a seawater circulating pump.
The LNG receiving station and the circulating water of the power plant circulating water device are jointly utilized, and the novel technology is not only a novel technology for utilizing cold energy of a large LNG receiving station, but also a novel technology for a closed circulating system.
The utility model discloses following beneficial effect has:
1. the overall investment of equipment, pipelines, electric instruments, marine systems and sites is reduced;
2. a set of closed circulating water devices are jointly shared, so that energy is effectively utilized in a gradient manner;
3. the closed circulation of the seawater avoids the limitation on temperature change in seawater taking and discharging water in the relevant environmental protection article;
4. a new LNG cold energy utilization technology is developed;
5. a novel closed circulating water system is developed.
Drawings
Fig. 1 is a schematic diagram of an LNG vaporization plant.
FIG. 2 is a schematic diagram of a plant circulating water system.
PIC0102 in FIG. 1 is a pressure indication instrument used for the whole control loop of the pressure detection and transmission system for controlling the opening degree of the FCV0101 valve; FIT0104 is an instrument used by the whole control loop of the pressure detection and transmission system for controlling the opening of the FCV0101 valve by flow indication; SSW0101 is a selection button used for remote selection of a control loop by a central control room operator; FXY0101 is a logic controller and is used for comparing three signals of temperature, pressure and flow, calculating a signal with larger deviation and sending the signal into a DCS (distributed control system); the FIC0101 is a flow indication control loop and is used for an operator to manually control the FCV 0101; FI0102 is a meter (flowmeter) for indicating the flow at the seawater outlet to control the flow detection of the seawater circulating pump and the whole control loop of the transmission system; the TICA0103 is used for indicating, controlling and alarming the temperature of the seawater outlet, detecting the temperature of the seawater outlet, controlling the opening of the valve TCV0101 and sending the water to an inlet and outlet switch valve of a switch IFV gasifier of the SIS system; FI0103 is used for indicating the flowmeter of the inlet seawater flow of the IFV gasifier, and TIA0102 is used for indicating the seawater temperature of the IFV gasifier (temperature indication alarm loop).
Detailed Description
The present embodiment will be described in further detail with reference to fig. 1 and 2.
As shown in fig. 1, the utility model discloses a system that LNG receiving station gasification equipment and power plant's circulating water jointly utilized includes: the system comprises an IFV gasifier 1, a seawater circulating pump P-0101 and a power plant circulating water system, wherein the power plant circulating water system comprises a circulating water cooling tower C-0201, a water pool 3 under the tower, a water suction pool 4, a water taking pump P-0201 and cooling water equipment 5 for each power plant;
the natural gas inlet end of IFV vaporizer is connected with the LNG inlet pipe, the natural gas outlet end is connected with the NG discharging pipe, the sea water inlet end connection of IFV vaporizer comes from the sea water pipe network of each water equipment of power plant, the sea water outlet end of IFV vaporizer connects the pond that absorbs water of power plant, the pond that absorbs water passes through each water equipment of pipe connection power plant, still be equipped with pressure regulating measurement sled 2 on the NG discharging pipe, the flow signal of measurement sled feedback, through FIT0104 (flow indication controller) or PIC0102 (pressure indication controller) to the LNG flow that IFV 0101 valve control return circuit FIC0101 adjusted the import, with the purpose of control receiving station NG exit pressure and flow.
A seawater circulating pump P-0101 for preventing sediment deposition in the gasifier pipe and a flow meter FI-0102 which detects a low flow signal (for example, seawater flow rate below 1000 m) are provided on the outlet pipe of the IFV gasifier3At/h) the seawater circulating pump P-0101 can be started. For example, the IFV gasifier seawater flow is below 1000m3When the flow meter detects a low flow signal, a low flow alarm is sent out in the central control room, and the seawater circulating pump P-0101 is started through hard-wire interlocking. In the normal operation process of the seawater circulating pump P-0101, the rotating speed of the seawater circulating pump is controlled through frequency conversion adjustment, and the seawater displacement is controlled.Simultaneously ensuring that the flow entering the inlet side of the seawater of the IFV gasifier is more than 1000m3And/h, ensuring long-term stable operation of the IFV gasifier and reducing the periodic cleaning cost.
In a circulating water system of a power plant, seawater enters a water tank 3 under a circulating water cooling tower C0201 from a seawater replenishing self-taking pump, then enters a water suction pool 4, enters each water using device 5 of the power plant through a circulating water pump P-0201, enters an IFV gasifier after heat exchange of each water using device 5 of the power plant, and a seawater outlet of the IFV gasifier is connected with the water suction pool, so that a closed circulating water system is formed.
According to the utility model discloses an embodiment sets up flowmeter FI-0103 at IFV vaporizer sea water inlet side, and is different in the sea water house steward position with the tradition setting, directly measures the sea water volume that gets into the import of IFV vaporizer.
Furthermore, an inlet shutoff valve ESDV-0101 is arranged on an LNG inlet pipe at a natural gas inlet end of the IFV gasifier, an outlet shutoff valve ESDV-0102 is arranged on an NG outlet pipe at a natural gas outlet end, when the seawater flow of the IFV gasifier is lower than a set value, a low-flow signal is detected by a flow meter, the low-flow signal is transmitted to a central control room through a transmitter and an instrument cable, a low-flow alarm is sent out in a DCS system, and the inlet shutoff valve, the outlet shutoff valve ESDV-0101 and the ESDV-0102 of the IFV gasifier are closed through an SIS system in an interlocking mode.
Furthermore, a temperature detection transmitter (TICA0103) and a Temperature Control Valve (TCV) are arranged on the seawater outlet side of the IFV gasifier, the opening of the TCV valve is automatically controlled through a hard line, the opening of the valve is increased when the temperature of the seawater is lower than 5 ℃, the opening of the valve is reduced when the temperature is higher than 5 ℃, the seawater is sent into a circulating water field pool (water suction pool) of the power plant, low-temperature cooling water is sent into each heat exchanger of the power plant for heat exchange by utilizing a circulating water pump P-0201 arranged in the power plant, high-temperature circulating water after heat exchange is returned to the IFV gasifier of the LNG receiving station, and LNG is gasified.
Furthermore, a temperature detection and transmitter (TICA0103) is arranged at a seawater outlet of the IFV gasifier, and after the temperature is monitored to be low and alarm, a signal is transmitted to the SIS system through an instrument cable, and the inlet and outlet shutoff valves ESDV-0101 and ESDV-0102 of the IFV gasifier are closed in an interlocking manner, so that a heat exchange tube of the IFV gasifier is not influenced by low temperature, and the equipment is prevented from being frozen and stopped.
Furthermore, a closed circulating water system is adopted, namely a whole set of closed circulating water flows in the system by connecting the IFV to the whole route of the cooling water system, so that the influence of an environment protection department on temperature rise on water taking and draining of the LNG receiving station is avoided, and the influence of large temperature rise change on marine organisms is reduced.
The advantages of the above system include:
(1) the LNG receiving station seawater gasification device and the power plant circulating water share one set of water taking equipment and system, so that the investment cost of the whole project can be reduced;
(2) the amount of seawater needed by the IFV gasifier is greatly reduced, and the reduction amount reaches 50%; meanwhile, the pipe diameter of the seawater pipeline can be further reduced, and corresponding pipe fittings, valves and the like are optimized, so that the investment of the gasification device is further reduced;
(3) the temperature of the seawater after heat exchange by the IFV heat exchanger is greatly reduced and the seawater is sent back to the power plant to be used as a cold source of a circulating water system, so that the cooling time of the circulating water can be reduced, the scale of a cooling tower is reduced, the utilization efficiency of the whole circulating water system is improved, and the investment of the power plant is further reduced;
(4) the energy consumption is reduced to a great extent, the environmental pollution is reduced, and the win-win situation of economic benefit and environmental benefit is realized.
(5) The influence of the temperature rise of 5 ℃ under the environmental protection on the direct discharge of the seawater is avoided.
(6) Meanwhile, the cascade utilization of cold energy and the closed circulation of circulating water are realized, and the cold energy and the heat energy are effectively utilized.
The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A system for combined utilization of LNG receiving station gasification unit and power plant circulating water, the system comprising: the system comprises an IFV gasifier, a seawater circulating pump and a power plant circulating water system, wherein the power plant circulating water system comprises a circulating water cooling tower, a water pool under the tower, a water suction pool, a water taking pump and cooling water equipment for each power plant which are sequentially connected;
the natural gas inlet end of the IFV gasifier is connected with an LNG feeding pipe, the natural gas outlet end of the IFV gasifier is connected with an NG discharging pipe, the seawater inlet end of the IFV gasifier is connected with a seawater pipe network from each water-using device of the power plant, the seawater outlet end of the IFV gasifier is connected with a water suction pool of a circulating water system of the power plant, and the water suction pool is connected with each cooling water device of the power plant through a pipeline;
a seawater circulating pump for preventing silt from depositing in a gasifier pipe and a flow meter are arranged on an outlet pipeline of the IFV gasifier, and the flow meter detects a low flow signal to start the seawater circulating pump.
2. The system of claim 1, wherein a temperature detector, a transmitter and a temperature control valve are arranged on the seawater outlet side of the IFV vaporizer, the valve opening of the temperature control valve is automatically controlled by a hard line, the valve opening is increased when the seawater temperature is lower than 5 ℃, the valve opening is decreased when the seawater temperature is higher than 5 ℃, the seawater is sent to a water suction pool of a circulating water system of the power plant, low-temperature cooling water is sent to each heat exchanger of the power plant by a circulating water pump arranged in the power plant for heat exchange, and high-temperature circulating water after heat exchange is sent back to the IFV vaporizer of the LNG receiving station for vaporizing LNG.
3. The system of claim 1 or claim 2, wherein a flow meter is provided on the seawater inlet side of the IFV gasifier for directly metering the amount of seawater entering the inlet of the IFV gasifier.
4. The system of claim 1 or 2, wherein an inlet shutoff valve is provided on the LNG feed pipe at the natural gas inlet end of the IFV vaporizer, an outlet shutoff valve is provided on the NG discharge pipe at the natural gas outlet end, and when the flow rate of seawater in the IFV vaporizer is lower than a set value, the flow meter detects a low flow signal, transmits the low flow signal to the central control room through the transmitter and the instrument cable, gives a low flow alarm in the DCS system, and closes the inlet shutoff valve and the outlet shutoff valve of the IFV vaporizer through the SIS system interlock.
5. The system of claim 1 or 2, wherein a temperature detection and transmitter is arranged at a seawater outlet of the IFV gasifier, and after the temperature is monitored to be low and alarm, a signal is sent to the SIS system through an instrument cable, and an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking manner, so that a heat exchange pipe of the IFV gasifier is not influenced by low temperature, and the equipment is prevented from being frozen and stopped.
6. The system according to claim 1 or 2, wherein a temperature detection and transmitter is arranged at a seawater inlet of the IFV gasifier, and after the temperature is monitored to be low and alarm, a signal is sent to the SIS system through an instrument cable, and an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking manner, so that a heat exchange tube of the IFV gasifier is not influenced by low temperature, equipment is prevented from being frozen and stopped, and a low-temperature interlock is arranged at the seawater inlet and outlet sides, so that the safe operation of the IFV gasifier is effectively ensured.
7. The system of claim 1 or 2, wherein in the circulating water system of the power plant, seawater enters the under-tower water pool of the circulating water cooling tower from the seawater replenishing self-pumping pump, then enters the water suction pool, enters each water-using device of the power plant through the circulating water pump, enters the IFV gasifier after heat exchange of each water-using device of the power plant, and a seawater outlet of the IFV gasifier is connected with the water suction pool, so that the closed circulating water system is formed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185930A (en) * | 2019-06-24 | 2019-08-30 | 新地能源工程技术有限公司 | A kind of LNG receiving station gasification installation combines the system utilized with electric power plant circulating water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185930A (en) * | 2019-06-24 | 2019-08-30 | 新地能源工程技术有限公司 | A kind of LNG receiving station gasification installation combines the system utilized with electric power plant circulating water |
| CN110185930B (en) * | 2019-06-24 | 2023-12-08 | 新地能源工程技术有限公司 | LNG receiving station gasification device and power plant circulating water combined utilization system |
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